Injection molded of the same durable material used in the magazine body itself” the +2 Magazine Extension was designed to comfortably accommodate a proper firing grip. With 2 additional rounds on board” ammunition capacity is now 8 + 1 in the weapon. Also included is a new longer” smooth feeding heat-treated stainless steel spring” with 100% last-round slide lock backs that are guaranteed. Fits Glock G43 model ONLY.